** Tags added: bjf-tracking
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https://bugs.launchpad.net/bugs/503138
Title:
Lucid & Natty, KVM, After kernel message hrtimer: interrupt too
slow.... the SMP kvm guest becomes slow.
Status in linux package in Ubuntu:
Incomplete
Status in qemu package in Ubuntu:
Incomplete
Bug description:
KVM Host is running a clean 9.10 server install with just qemu-kvm and
virt-manager kernel=2.6.31-17-generic
uname -a: Linux VMMASTER 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 16:20:31
UTC 2009 i686 GNU/Linux
version signature: Ubuntu 2.6.31-17.54-generic
KVM Guest is running a clean 9.10 server install with some userland services
(apache/postfix/whatnot) kernel=2.6.31-16-generic-pae (from the
linux-image-virtual package)
uname -a: Linux VM1 2.6.31-16-generic-pae #53-Ubuntu SMP Tue Dec 8 05:20:21
UTC 2009 i686 GNU/Linux
version signature: Ubuntu 2.6.31-16.53-generic-pae
KVM guest startup command (as invoked by virt-manager):
/usr/bin/kvm -S -M pc-0.11 -m 1024 -smp 2 -name lexx -uuid [UUID] -monitor
unix:/var/run/libvirt/qemu/VM1.monitor,server,nowait -boot c -drive
file=,if=ide,media=cdrom,index=2 -drive
file=/var/lib/libvirt/images/VM1.img,if=virtio,index=0,boot=on -net
nic,macaddr=[MAC],vlan=0,model=virtio,name=virtio.0 -net
tap,fd=16,vlan=0,name=tap.0 -serial none -parallel none -usb -vnc 127.0.0.1:0
-k en-us -vga cirrus
Problem description:
After a while (and high network IO) I see this pop up in my guest dmesg:
hrtimer: interrupt too slow, forcing clock min delta to 215997540 ns
after that the guest becomes very slow to respond, sometimes taking seconds
to echo my ssh input back, on a local lan. Only a reboot of the kvm guest fixes
this, until the dreaded hrtimer message pops up
After a lot of googling and trying a lot of things I found this discussion on
the patchwork kernel mailinglist, which contains a possible solution:
http://patchwork.kernel.org/patch/51561/
Please look into it, perhaps this solves a lot of kvm-users' problems
I'd like to patch my kvm guests' kernel myself to test this hrtimer
patch, do you have the correct procedure for me so i can create a
custom kernel?
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